Meclizine and pregnancy

England Journal of Medicine -- May 18, 2000 -- Vol. 342, No. 20, : nejm content 2000 0342 0020 ad oehi e T " ofco i e si dne r .C nlt fn r tn drug trials: a risk factor for scientific miscodc" H SC nlt fn r t ec, u 1.00 nut D H ofco It e C neA g 520 , i es r ohrp.osophs.dhhs.gov coi bodenheimer.
Self-audit Guide S ; COMP 170 - Basic Computer Operation You will be introduced to basics of computer concepts. Topics you will study include computer components, hardware and software, working in a graphical user interface, file management, word processing and the Internet. The general skills you learn in this course will prepare you for further courses such as word processing, spreadsheets and presentation graphics. Accumulation of quinolones previous lack of data to support the hypothesis that fluoroquinolones enter P. aeruginosa via a carrier-mediated process may be a consequence of the fact that only a few agents have been investigated, and not always because of the high concentrations used in the present study. However, many mutant E. coli, S. aureus and P. aeruginosa have been selected in the last 10 years, and there has been no description of a transport mutant with defective uptake into the cell. Secondly, the observed effect could be a result of experimental artefacts. For example, calculation of initial rates could have been inaccurate because of the long periods of drug exposure exposure during accumulation experiment plus centrifugation times however, at each sampling time the cells were immediately cooled then centrifuged. This has previously been shown to prevent efflux of drug.23 There is also linearity of the rates of accumulation at the early sampling time points data not shown ; . P. aeruginosa is lysed by chelators such as EDTA, so it is possible that, at high fluoroquinolone concentrations, drug-mediated chelation of divalent cations results in cell lysis with drug release, creating an artifical plateau and apparent Vmax. However, supplementing the medium with 20 mM magnesium chloride did not abolish the phenomenon, and no significant decrease in cell numbers has been observed data not shown ; . The experimental conditions may have been such that only the fluoroquinolone bound within the cell was retained and that free fluoroquinolone was washed out by the washing steps; however, this artefact would be present in all experiments with all three species and the `saturation' data are predominantly for P. aeruginosa. The procedure used for P. aeruginosa differed slightly from that used for the other two species because in previous experiments after reaching a maximum concentration there was significant loss of fluoroquinolone; 10, 14 despite this the steady-state concentration from these experiments and the initial rates are remarkably similar to the results of previous experiments with the same method used with S. aureus and E. coli. In addition, the values for accumulated fluoroquinolone reflect binding to a cellular compartment, and for P. aeru ginosa the saturation observed at comparatively low quinolone concentrations may have been due to structural differences in the cell envelope of this species and not saturation of an accumulation process. Finally, the observed effect could have been due to bactericidal action of the drugs, but a previous study obtained similar data after a 5 min exposure, 15 and as the most microbiologically active agents did not saturate, this is unlikely. The CCCP-induced increase in the concentration of quinolones accumulated by bacteria has been variously interpreted. Early studies7, 24 proposed that CCCP blocks an energy-dependent efflux system for quinolones, with a consequent increase in the concentration of these agents 69 accumulated. The CCCP effect has also been interpreted to be the result of a perturbation of the outer and the cytoplasmic membranes resulting in the influx of quinolones into bacteria.5 Such perturbation was proposed to result from a collapse in the pH gradient of the cytoplasmic membrane by CCCP.6 Evidence for this proposal was derived from the studies of Furet et al., 12 who demonstrated an increase in the concentration of pefloxacin into phosphatidylglycerol liposomes in the presence of CCCP at pH 5.2, but no effect was seen at pH 7.4. The present study demonstrated an increase in the concentration of most quinolones into a susceptible strain of E. coli in the presence of CCCP at pH 7.0, and that this increase was greater for intact cells than for spheroplasts. At the pH typically used in the measurement of accumulation of quinolones, i.e. pH 7.0, it is possible that differences between the external and intracellular pH may be more limited than at pH 5.2, the pH at which pefloxacin accumulation was measured with phosphatidylglycerol liposomes. However, because of the difference in pH between the external and the intracellular compartments, it is likely that most quinolones accumulate in the periplasm of E. coli and cytoplasm of S. aureus by simple diffusion due to a concentration gradient. Therefore, the effect of CCCP observed in the present study at pH 7.0 probably does suggest the presence of an energy-dependent efflux for quinolones in E. coli, most likely via the AcrAB and TolC system.6, 23, 25 The extent of the CCCP effect varied for the quinolone and for the species, perhaps reflecting substrate specificity of the efflux system. In conclusion, the data for E. coli and S. aureus suggest that accumulation of most quinolones into these bacteria proceeds by simple diffusion. These data also suggest that broad conclusions for the class based upon data obtained with a single drug and one bacterial species are not possible.

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Understanding the basis of virulence is important for vaccine design, so that viruses can be safely attenuated. Both influenza H5 and H7 subtypes have the ability to evolve into highly pathogenic forms. The precise molecular determinants that confer virulence of avian and human viruses and the circumstances under which virulent phenotypes emerge remain unclear. However, the ease with which the haemagglutinin is cleaved and activated is a major contributing factor. The haemagglutinin of low-pathogenic avian viruses is cleaved by proteases essentially restricted to the avian intestinal tract resulting in limited pathology. In contrast, acquisition of multiple basic amino acids at the cleavage site in HPAI H5 or H7 haemagglutinin enables cleavage by widespread tissue proteases, resulting in systemic spread including respiratory and central nervous system infection. In humans, infection with H5N1 virus results in a severe and an unusually aggressive illness with high mortality and complication rate when compared with infection with epidemic human influenza. Infection of human macrophages in vitro with HPAI H5N1 viruses induces high levels of cytokines compared with some human influenza strains [44]. Additionally, H5N1 viruses appear relatively resistant to the inhibitory effects of host antiviral cytokines, such as interferons [45]. Thus, the severity of human H5N1 infection may be related to the induction of excessive proinflammatory responses that can accompany a primary infection and viraemia and medrol.

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